Bevel, level, and protractor instrument



April 30, 1946. w. THOMAS BEVEL, LEVEL, AND PROTRACTOR INSTRUMENT 2 Sheets-Sheet 1 Filed April 15, 1943 maxim Tfima K.

April 30, 1946. w TH' AS' 2,399,303

'BEVEL, LEVEL, AND PROTRACTOR INSTRUMENT Filed April l5, 1943 2 Sheets-Sheet 2 Patented Apr. 30, 1946 UNITED STATES PATENT OIFFICET BEVEL, LEVEL, AND rao'rimc'roa INSTRUMENT William Thomas, San Francisco, Calif.

Application April 15, 1943, Serial No. 483,213

3 Claims. (Cl. 33-88) This invention relates to a bevel, level, and protractor instrument, tool, or combination.

It is particularly aimed to provide a construe tion having a novel angle divider and a novel combination utilizing such divider in connection with levels selectively applicable to the stock of the bevel and the angle divider, particularly to enable the finding of longitudinal lines on cylinders r cones.

I further aim to provide a novel angle divider which is applicable as an attachment to the pivot bolt of a bevel, and which is of a particular construction to facilitate such end, and the selective use of a level in connection therewith.

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings:

Figure 1 is a view in elevation of the improved instrument or tool;

Figure 2 is a view similar to Figure 1 showing the instrument or tool in use as during the finding of longitudinal lines on a cylinder or cone;

Figure 3 is an end elevation of the instrument or tool with the angle divider removed;

Figure 4 is a detail section taken on the line 4-4 of Figure 1;

Figure 5 is an elevation of the angle divider alone, with a bevel positioned thereon;

Figure 6 is an edge view of the parts of Figure 5;

Figure 7 is an elevation, partly broken away, of the stock; and

Figure 8 is an elevation of the bevel protractor blade or arm.

Referring specifically to the drawings wherein like reference characters designate like or similar parts, In designates a stock having a screw threaded thereto as at l2. This stock has spacedapart plates 3, rigidly secured together by means of interposed blocks or spacers I4 and rivets or bolts l5 passing through such spacers and the plates. The outermost plate l3 has a central longitudinal slot l6 open at one end between the inner ends of the spacers M, as best shown in Figure 7.

Conventional spirit levels or any equivalent are for use at right angles to each other, are removably positioned on the stock In and to this end the spirit levels I! have T-shaped heads l8 which are positioned and movable in the slot l6 and the space between the plates l3, the heads l8 having sufllcient frictional engagement with the plates to remain in position on the stock but so as to enable ready removal and replacement.

The aforesaid bolt I bridges the space between the plates l3 and extends through both plates l3, although screw-threaded to only one of them, to afiford maximum bearing. Pivotally mounted on such bolt between the plates I3 is a protractor blade or arm l9 which has protractor calibrations 2B concentric with the bolt II. The plate |3 opposite said calibrations 20 is cut away or reduced as at 2| in order to expose the calibrations. If desired, any suitable type of peep sight may be slidably and removably applied in an undercut groove 22 centrally and longitudinally of 'the protractor blade l9.

It will be realized that the structure thus described may be used as an ordinary bevel, level, or protractor.

In association with the foregoing parts, I preferably provide an angle divider structure generally designated 23, which may be made of any suitable material such as flexible sheet metal, plastic, or the equivalent. This divider has a blade at 24, provided with a longitudinal edge at 25 in line with the center line of the blade and axis of the screw Such divider has a central longitudinal slot 26 slidably and turnably mounting the divider on a cylindrical enlargement 2! of the screw concentric with its longitudinal axis. Said slot 26 is provided between tine 28 integral with the blade 24, and a tine 29 pivoted at 30 to such blade. A closure element 3| is pivoted at 32 to the movable tine 29 and it has a lug 33 adapted to overlap the fixed tine 28. A screw 34 is mounted in the lug 33 and movable into binding relation with the tine 28 to maintain the closure 3| and time 29 fixed with respect to the tine 28 and the slot 26 thus closed. It will be realized that the opening of the closure 3| and swinging of the tine 29 facilitate the application and removal of the divider blade to and from the bolt In addition, said closure 3| and removable tine 29 facilitate the application and removal of either spirit level I! to and from the slot 26 since the neck |8a of the heads of the spirit levels will fit and slide in the slot 26 as they lit and slide in the slot l6 and the heads l8 will underlap the tines 28 and 29. Further, the tightening of the screw 34 may be to such a degree as to secure the angle divider 23 fixed with respect to the enlargement 21 and also to bind the heads l8 of the spirit levels in the slot 26 between the tines 28 and 29.

The various geometrical or equivalent uses of the parts of the parts of the tool or instrument will be apparent, but it is particularly adapted for use in finding, through the coactlon of the angle divider 23, the center lines of cylinders or cones such as C in Figure 2, and especially with the aid of one of the levels, the longitudinal lines on such a cylinder or cone.

Various changes may be resorted to provided that they fall within the spirit and scope of the invention.

I claim as my invention:

1. In combination with a stock, a blade and a pivot member securing them together, an angle measuring element of the class described, such element having a slot open at one end whereby said element is pivotally and slidably mounted on said pivot member, and closure means for said open end of the slot to prevent detachment of the angle element from the pivot member.

2. In combination with a stock, a blade and a pivot member securing them together, an angle measuring element of the class described, such element having a slot open at one end whereby said element is pivotally and slidably mounted on said pivot member, and closure means for said open end of the slot to prevent detachment of the angle element from the pivot member, consisting of a bar pivoted on one side of the slot, and means to secure the bar in place against pivotal movement on the other side of the slot.

3. In combination with a stock, a blade and a pivot member securing them together, an angle measuring element of the class described, such element having a slot open at one end whereby said element is pivotally and slidably mounted on said pivot member, and closure means for said open end of the slot to prevent detachment of the angle element from the pivot member, consisting of a bar pivoted on one side of the slot, and means to secure the bar in place against pivotal movement on the other side of the slot, the part of the element on one side of said slot being a tine pivoted to the remainder, said element having a centerline edge at a portion thereof.

WILLIAM THOMAS. 

